[smokeping-users] Graph scale problem

G.W. Haywood ged at jubileegroup.co.uk
Mon Apr 28 10:42:59 CEST 2008

Hi Tobi,

On Sat, 26 Apr 2008, Tobias Oetiker wrote:

> G.W. Haywood wrote:
> >
> > ... on many occasions I've seen graphs
> > where the highest median RTT is different for the same periods on
> > different graphs.  I understand the difficulty of showing data with a
> > large dynamic range on a single graph with clarity, but since this is
> > exactly the sort of thing that we're looking for I'd call this a bug.
> >
> > http://www.jubileegroup.co.uk/JOS/misc/scales_oddity.gif
> >
> > Maybe graphs should default to a logarithmic scale?
> The reason the 'spike' is lower in the last 10 day graph is that a
> single pixle there represents more data than in the higher
> resolution graphs ... the net result is, that the spike becomes
> lower as it gets distributed across time ...

With the result that the graphs give a very misleading impression of
the data under certain circumstances.

I see that you've made some changes in the latest version - the
announcement arrived just after I sent my post.  I'll have a look at
it before commenting further.



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